APA (7th ed.) Zitazioa

Ward, J. A., & Hetzel, H. R. (1980). Biology: Today and tomorrow. Minn West.

Chicago Style (17th ed.) Zitazioa

Ward, Jack A., eta Howard R. Hetzel. Biology: Today and Tomorrow. St. Paul.: Minn West, 1980.

MLA (9th ed.) Zitazioa

Ward, Jack A., eta Howard R. Hetzel. Biology: Today and Tomorrow. Minn West, 1980.